Olympic National Park---Washington State Sept 2013

I really liked Sol Duc campground (and the hot springs) when we were there. You probably won't fit in the NF campground there, but there's a private one right next to it that you will fit in (not nearly as pretty, just a parking lot). There's some hiking near there at the end of the local access road.

The Hoh Rain Forest is also a must see, but definitely a day trip for you. There's some short hikes/nature trails that are very unique, nowhere else like it.